Today a Nature paper by Rodrigo Ibata and collaborators appeared, titled “A vast, thin plane of co-rotating dwarf galaxies orbiting the Andromeda galaxy”. It is extremely relevant for my research (the structure resembles the VPOS around the MW) and therefore has game-changing implications for the research areas of galaxy formation and near-field cosmology. Unfortunately the Nature letter contains only little discussion and interpretation. This is why I’ve written a blog post on this topic, discussing some ideas for the origin of such a structure: “Andromeda’s satellites behave as expected … if they are tidal dwarf galaxies”